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设计了一款双频带宽带双极化定向电磁偶极子天线。首先,采用最基本的电磁偶极子天线模型,通过对偶极子天线的形状进行调整以及增加Г形寄生枝节实现了双频段单极化定向电磁偶极子天线。其次,将两个单极化电磁偶极子天线十字交叉放置。最后,通过两个高度不同的Г形探针分别对两个天线进行耦合馈电,实现双频宽带双极化定向辐射特性。根据仿真结果,对天线模型进行了加工和测试。仿真和实测结果表明:天线在低频段0.8~0.96 GHz和高频段1.7~2.7 GHz内反射系数的模值均小于-10 d B,所对应端口隔离度分别大于20 d B和25d B,天线的测试峰值增益在低频和高频段分别为5.5 d Bi和8.2 d Bi。该天线可应用在无线通讯系统中。
A dual-band dual-polarized directional electromagnetic dipole antenna was designed. First of all, using the most basic electromagnetic dipole antenna model, a dual-band monopole directional electromagnetic dipole antenna is realized by adjusting the shape of the dipole antenna and adding Г-shaped parasitic branches. Second, place two unipolar electromagnetic dipole antennas in a crisscross pattern. Finally, the two antennas are coupled and fed respectively by two Г-shaped probes with different heights to achieve dual-band broadband dual-polarization directional radiation. According to the simulation results, the antenna model was processed and tested. The simulation and experimental results show that the modulus of the reflection coefficient of the antenna in the low frequency band of 0.8 ~ 0.96 GHz and the high frequency band of 1.7 ~ 2.7 GHz is less than -10 d B, the corresponding port isolation is greater than 20 d B and 25 d B respectively, The test peak gain is 5.5 d Bi and 8.2 d Bi at low frequency and high frequency, respectively. The antenna can be used in wireless communication systems.